CT metal artifact reduction - single energy metal artifact reduction (SEMAR) algorithm

Discussion:

Metallic implants cause beam hardening effects and photon starvation resulting in streak artifacts. This can interfere with the evaluation of adjacent soft tissues as well the prostheses and supporting bone structures as in this case. Single energy metal artifact reduction (SEMAR) reconstruction technique (Canon/Toshiba) was used on the volumetric scan eliminating streak artifacts that were seen on the raw data allowing for more accurate diagnosis of the clinical presentation. 

Metal artifact reduction (MAR) algorithms can be set in the scan protocol allowing for fully automatic reconstruction, requiring no additional operator input. A study in 2015 showed that a comparison between three MAR algorithms implied a general noise reduction (up to 67%, 74% and 77%) and an improvement in CT number accuracy, both in regions close to prostheses and between the two prostheses 1.

Disclosure: I, Dinesh Brand, have no actual or potential ethical or financial conflict of interest in relation to this device. This case is not intended to be a personal endorsement or recommendation of this product.

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